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MisterTwister 2nd September 2009 04:36 AM


Originally Posted by rdf (
Is the elevated frequency response above ~200 Hz a baffle step artifact?

I think baffle step effect occurs much higher in frequency.
looks like it happens at 400-600hz region here.
and rising frequency from 2k and above is energy storage or cone resonance, whatever you call it.

audiokinesis 2nd September 2009 06:25 AM

Bob, your plots look similar to what I got. No single curve looks really great, BUT the average of all the curves - which corresponds reasonably well with the power response - is quite good. Something else educational here: the on-axis curve does not begin to paint a complete picture, nor does any other single curve.

konut 2nd September 2009 12:59 PM

Duke or Bob, would these be a drop in replacement for a Visaton B200?

audiokinesis 2nd September 2009 05:44 PM

Konut, I don't think so. The Visaton has VERY different T/S parameters. In my opinion not even the W8-1808 would be a drop-in replacement. I think the Hemptone (from the makers of Tone Tubby) 8" fullrange may be a possible alternative to the Visteon. Supravox makes another possibility, the 215 Bicone.


konut 2nd September 2009 07:02 PM

Thanks Duke.

Holger Barske 2nd September 2009 07:32 PM

There is nothing like a "drop in replacement". A different driver makes a different speaker.

konut 2nd September 2009 09:38 PM

Well yeah. I was hoping for something with less of a peak in the 4k to 7k range, and a little more efficiency than the B200 that was the same dimensionally yet was close enough in T/S parameters to drop in my aperiodic boxes. Hope springs eternal.

hm 3rd September 2009 07:05 AM

2 Attachment(s)
Thanks Bob,
for the detailed measurement,
my Saxophon and the RDH20
horn would work.

freddi 5th September 2009 04:01 AM

hey Bob - how far does it travel til the back plate is smacked? - is power handling good on drums and bass? - - BEST, Freddy

Bob Brines 5th September 2009 11:27 AM


Originally Posted by freddi (
hey Bob - how far does it travel til the back plate is smacked? - is power handling good on drums and bass? - - BEST, Freddy

I didn't measure the distance, I just noted this while setting up the break-in frequency/power. My guess is that it is in th 5-6mm range. It really shouldn't be an issue at anything but dangerous SPL levels. Note that in my cabinet, a stereo pair will produce 105dB/w/m at 10 watts exceeding Xmax below 30Hz. Unlike Fostex or Lowther drivers, the TB really needs a high pass filter to eliminate infrasonics.

The 1772 is a very clean, low distortion driver. Under normal full-range rules, dynamic compression should not be an issue. However, Doppler distortion is still an issue, even more so since there is +/- 3mm travel available. I can hear this as I progress through Vivaldi > Beethoven > Pink Floyd > Led Zeppelin. Dynamics in the lighter stuff is super, but the heavier stuff starts to get muddy.


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